EP2962347B1 - Nanostructures d'oxyde de titanium pour électrodes de piles à combustible - Google Patents

Nanostructures d'oxyde de titanium pour électrodes de piles à combustible Download PDF

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EP2962347B1
EP2962347B1 EP13707833.3A EP13707833A EP2962347B1 EP 2962347 B1 EP2962347 B1 EP 2962347B1 EP 13707833 A EP13707833 A EP 13707833A EP 2962347 B1 EP2962347 B1 EP 2962347B1
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nanotubes
titanium
nanostructures
membrane
oxide
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EP2962347B8 (fr
EP2962347A1 (fr
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Isotta Cerri
Julien Roussel
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Toyota Motor Corp
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    • H01M4/8663—Selection of inactive substances as ingredients for catalytic active masses, e.g. binders, fillers
    • H01M4/8673—Electrically conductive fillers
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    • H01M4/8647—Inert electrodes with catalytic activity, e.g. for fuel cells consisting of more than one material, e.g. consisting of composites
    • H01M4/8657—Inert electrodes with catalytic activity, e.g. for fuel cells consisting of more than one material, e.g. consisting of composites layered
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    • B29C66/7314—Electrical and dielectric properties
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
    • B29C66/7428—Transition metals or their alloys
    • H—ELECTRICITY
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    • H01M4/88—Processes of manufacture
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    • H01M4/881—Electrolytic membranes
    • H—ELECTRICITY
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    • H01M4/88—Processes of manufacture
    • H01M4/8803—Supports for the deposition of the catalytic active composition
    • H01M4/8814—Temporary supports, e.g. decal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/88—Processes of manufacture
    • H01M4/8878—Treatment steps after deposition of the catalytic active composition or after shaping of the electrode being free-standing body
    • H01M4/8882—Heat treatment, e.g. drying, baking
    • H—ELECTRICITY
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    • H01M4/88—Processes of manufacture
    • H01M4/8878—Treatment steps after deposition of the catalytic active composition or after shaping of the electrode being free-standing body
    • H01M4/8896—Pressing, rolling, calendering
    • H—ELECTRICITY
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    • H01M4/90—Selection of catalytic material
    • H01M4/9016—Oxides, hydroxides or oxygenated metallic salts
    • H—ELECTRICITY
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    • H01M4/90—Selection of catalytic material
    • H01M4/92—Metals of platinum group
    • H01M4/925—Metals of platinum group supported on carriers, e.g. powder carriers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3468—Batteries, accumulators or fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • the present invention relates to structures comprising presentations of titanium oxide nanostructures, such as nanotubes, on a polymer membrane, and also to methods for producing such structures.
  • the structures of the invention may be useful for polymer electrode membrane (PEM) fuel cell electrodes (either at the cathode or the anode), and may also be useful supports for other electrochemical or catalytic devices, such as batteries, solar cells, and sensors.
  • PEM polymer electrode membrane
  • H 2 hydrogen
  • O 2 oxygen
  • Platinum (Pt) is a highly active material acting as a catalyst in such fuel cells, and can be used at both the cathode and anode.
  • platinum catalysts are commonly employed to assist in the oxygen reduction reaction (ORR).
  • FIG. 1 A known format of a catalyst layer on a polymer electrolyte membrane (PEM) fuel cell cathode is shown in Figure 1 .
  • the catalyst layer shown here with a thickness of approximately 10 ⁇ m, contains platinum catalyst on a carbon support, intermixed with ionomer.
  • Typical polymer electrolyte materials are perfluorosulfonic acid (PFSA) polymers, such as those commercially available under the trademarks Nafion®, Aquivion®, Flemion®.
  • the catalyst material most typically Pt or Pt-alloy, notably in view of its stability in the very acidic conditions involved, promotes the oxygen reduction reaction by minimising the activation overpotential, facilitating the cathode reaction 1 ⁇ 2 O 2 + 2H + + 4e - ⁇ H 2 O, but can also be used at the anode to facilitate H 2 oxidation, in the anode reaction: H 2 ⁇ H + + 2e - . Most preferably 2 to 5 nm diameter Pt or Pt alloy particles are used.
  • the catalyst support provides an increased surface area to the Pt-based catalyst and should also provide electrical conductivity to transfer the electrons, a porous structure to enable gas diffusion and water transport, and stability in electrochemical conditions.
  • the most common support materials are carbon-based, typically 30 to 100 nm average diameter activated carbon powder, such as commercially available Vulcan® or Ketjen® carbon materials.
  • Pt catalyst is loaded at an amount of 10 to 60 weight percent with respect to the carbon support material.
  • a known method of preparing a Membrane Electrode Assembly by transferring a catalyst layer onto the polymer electrolyte membrane is an “ink-based” process. It can be described as follows:
  • a structure for a fuel cell cathode catalyst layer not involving an "ink layer” is disclosed in US 7 622 217 .
  • a nanostructured thin-film (NSTF) catalyst layer is disclosed wherein there is no carbon support, and no ionomer (ink layer).
  • Organic crystalline whiskers act as a catalyst support, with a Pt-based catalyst loading, the catalyst comprising Pt in combination with other metals.
  • An electrode layer of less than 1 ⁇ m thickness can be produced.
  • the NSTF structure risks here being not mechanically robust, and the structure may not be retained during membrane electrode assembly (MEA) preparation and FC (fuel cell) operation.
  • MEA membrane electrode assembly
  • FC fuel cell
  • titania (TiO 2 ) nanotubes are known as materials and can be prepared inter alia by anodization of titanium metal films.
  • CN 101560669 describes a method for preparing TiO 2 nanotubes by anodization on a titanium metal substrate. A catalytic electrode is then prepared wherein a noble metal (such as Pt, Pd) is deposited on the nanotubes using pulse current combined with ultrasound.
  • a noble metal such as Pt, Pd
  • WO 2010/080703 describes the preparation of nitrogen-doped titania nanotube arrays and their use in photocatalytic conversion of carbon dioxide into hydrocarbons in the presence of water vapour.
  • Titanium (di)oxide nanotubes can also be prepared, apart from anodization techniques, by technologies involving treating titanium oxide with alkaline materials such as alkali metal hydroxides. Formation of a sol solution of titanium oxide in water, optionally with a lower alcohol cosolvent, can be carried out followed by treatment with a peroxide material such as hydrogen peroxide, followed by successive treatments with an alkali metal hydroxides and a cation source. Electrospinning can also be used to produce TiO 2 nanotubes, and also TiO 2 nanofibres, by using a core solution of a removable material such as mineral oil and a sheath solution of sheath material such as a titanium alkoxide (and other typical sol-gel precursor-type materials).
  • a peroxide material such as hydrogen peroxide
  • Electrospinning can also be used to produce TiO 2 nanotubes, and also TiO 2 nanofibres, by using a core solution of a removable material such as mineral oil and a sheath solution of
  • the core solution of removable material and the sheath solution of sheath material are subjected to a high-voltage and forced through a spinneret.
  • These various techniques for titania nanotube preparation are detailed in US 2010/0258446 , which more specifically relates to catalytic materials having palladium dispersed on the nanotube surface, for use in photocatalytic conversion of carbon dioxide into reduced carbon compounds, such as methanol, in the presence of water vapour.
  • US2013/0032269 discloses a fuel cell catalyst layer comprising TiO 2 nanotubes as carrier for catalyst particles like Pt, the nanotubes being substantially vertically aligned on the proton-conducting polymer membrane.
  • titanium (di)oxide structures such as a titanium (di)oxide nanotube (TNT) array
  • TNT titanium (di)oxide nanotube
  • the vertically or substantially vertically aligned titania nanotube (TNT) arrays on polymer elelctrolyte membrane supports may be coated with noble metal alloys, such as platinum (Pt) or platinum alloy, which may be in the form of particles, which is of particular interest in applications such as fuel cell electrodes.
  • noble metal alloys such as platinum (Pt) or platinum alloy, which may be in the form of particles, which is of particular interest in applications such as fuel cell electrodes.
  • the structures obtained provide increased electrochemical and structural stability e.g. in fuel cell electrode applications, as compared to systems based on fine carbon particle supports, whilst providing a high standard of mass transfer for reaction species involved in cathode, or anode, reactions.
  • a thickness typically equal to or less than 2 ⁇ m it is believed that no ionomer is necessary to ensure ion transfer, and therefore the catalyst layer can be ionomer-free.
  • FIG. 2 shows a schematic view of a Pt-coated titania nanotube (TNT) array on a polymer membrane support according to the present invention.
  • This embodiment shows vertically, or substantially vertically, aligned (titania) nanotubes on a polymer support, wherein no ionomer is present in the catalyst layer. It is in effect considered possible using the technology of the present invention to have a catalyst layer on a polymer membrane support, the membrane containing ionomer, wherein the thin but structurally stable catalyst layer does not need to contain dispersed ionomer.
  • the present invention relates to a structure comprising a layer comprising titanium (di)oxide nanotubes, in contact with a membrane layer comprising a proton-conducting polymer as disclosed in claim 1.
  • the present invention relates to a process for the preparation of a structure of the invention, the process comprising the steps of:
  • a number of nanostructures are considered to be “one-dimensional” in that they have a string-type shape with a string cross-section very much less than their length.
  • Such "one-dimensional" nanostructures have been called by a variety of names including: (nano)whiskers, (nano)fibers or (nano)fibrils, nanowires and nanorods.
  • nanotubules and nanocables are also considered one-dimensional structures.
  • nanofibers are often used to describe shorter-length structures than “(nano)fibers” and “nanowires”, although there is not an accepted standard distinction between the groups. In most instances, all of the dimensions of “nanorods” lie in the range of 1 nm to 100 nm. Typical aspect ratios (length divided by width) are from 3 to 5. Nanofibers are usually defined as fibers with diameters of less than 100 nm.
  • nanotubes are used, these being structures which show an internal cavity.
  • anodization of a Ti film may be used to produce TiO 2 nanotube arrays.
  • Anodization (anodic oxidation) is a known method for making titania nanotubes.
  • a tubular titania layer is formed instead of a compact oxide layer.
  • the first generation of TiO 2 nanotube (TNT) arrays was grown in aqueous hydrofluoric acid (HF) electrolytes (as reported in Zwilling et al., Electrochim. Acta, 45 (1991), 921 ).
  • the nanotube layer is limited to 500-600 nm due to rapid chemical etching by HF, which dissolves most of the growing oxide preventing long tube formation.
  • the rapid titania dissolution by HF is reduced by substitution with a less aggressive solution containing fluoride salts such as ammonium fluoride (NH 4 F) and sodium fluoride (NaF).
  • fluoride salts such as ammonium fluoride (NH 4 F) and sodium fluoride (NaF).
  • NH 4 F ammonium fluoride
  • NaF sodium fluoride
  • a titanium metal film in an electrolyte bath containing a polar non-aqueous organic solvent, optionally containing a certain amount of added water.
  • the Ti metal film usually has a thickness of less than 1 mm, and more than 5 ⁇ m), typically about 100 ⁇ m.
  • the organic solvent may for example be a glycol, such as ethylene glycol, diethylene glycol (DEG) or polyethylene glycols, glycerol, or dimethyl sulfoxide (DMSO). It is also possible to add highly ionic conductive organics, such as ionic liquids i.e.
  • BMIM-BF 4 1-butyl-3-methylimidazolium tetrafluoroborate
  • Water may be added, for instance in the amount of from 0 to 4% by mass in the total electrolyte bath.
  • a fluoride source such as hydrogen fluoride may be used.
  • Other possible fluoride sources include NH 4 F, NaF, and ammonium tetrafluoroborate (NH 4 BF 4 ).
  • the fluoride source may appropriately be added in an amount of between 1 to 2% by mass in the total electrolyte bath.
  • the voltage is applied is between 20 V and 30 V.
  • a generally appropriate duration of anodization is between 20 and 120 hours.
  • anodization of Ti foil can be used to make nanorods (cf. Lin et al., Journal of The Electrochemical Society, 159 (1) K5-K9 (2012 )), and nanofibres (cf. Beh et al., Applied Surface Science, vol. 257, no. 10, pp. 4706-4708, 2011 ).
  • VLS vapor-liquid-solid
  • MOCVD metal organic chemical vapor deposition
  • hydrothermal processes hydrothermal processes
  • template-assisted routes offer different advantages over other techniques due to the production of 1D titanium dioxide with uniform diameter and desired length (Liu, Xia, Xue, & Lu, 2009).
  • the template is dipped directly into the precursor solution for the appropriate period of time.
  • the precursor solution can be prepared by the sol-gel process.
  • Figure 4 is a schematic diagram showing geometrical attributes of nanotubes and nanotube arrays and how distances of and between nanotubes are to be understood in the framework of the present invention.
  • Nanotube geometry can be studied by scanning electron microscopy (SEM). By carrying out statistical sampling of a number of nanotubes in arrays, both their internal dimensions and inter-tube spacings can be calculated, and thence average (mean) values for the distances between outer walls of nanotubes (average S in Fig. 4 ), and average (mean) values for the overall outer diameter of nanotubes (average D out in Fig. 4 ), or inner diameter (average D in in Fig. 4 ).
  • the spacing between nanotubes is believed to be a significant factor in fuel cell applications because it is important to ensure not only high surface area, which would be favoured by narrow spacing and long nanotubes, but also water/gas management. It is hypothesised that an inter-nanotube spacing of, on average, 80 to 200 nanometres (nm) would be an appropriate compromise value to provide high surface area for catalysis and also easy mass transport.
  • the internal diameter of nanotubes is also believed to be a relevant factor in catalytic applications such as fuel cell applications because the catalyst can also be deposited inside the nanotubes, providing a larger electrochemical surface area. It is currently envisaged that an internal diameter (from the inside wall of a nanotube through to the opposite inside wall going through the geometrical centre of a circular or substantially circular planar cross-section) should appropriately in the range 80 to 200 nm to enable the deposition of Pt particles while still providing good properties of mass transfer (gas/water).
  • a preferred mean distance measured between the outside faces of adjacent nanotubes is between 50 nm and 400 nm, more preferably between 60 and 200 nm, and still more preferably between 80 and 150 nm.
  • a preferred mean inner diameter of nanotubes is between 80 nm and 400 nm, and a preferred mean outer diameter of nanotubes is between 100 nm and 500 nm.
  • a preferred mean length of nanotubes is between 0.5 ⁇ m and 1.5 ⁇ m.
  • the layer comprising titanium (di)oxide nanostructures contains an array of titanium (di)oxide nanotubes (TNT), wherein the mean angle of elevation of the longitudinal direction of the nanotubes with respect to the plane of the membrane layer is at least 30°, preferably at least 70°, and most preferably the nanotubes are vertically or substantially vertically aligned on the membrane (angle of elevation about 90°), so that the main axis of the cylinders constituting nanotubes is perpendicular to the membrane surface.
  • TNT titanium (di)oxide nanotubes
  • a TNT array prepared in the present invention on a first substrate such as a Ti metal film
  • a first substrate such as a Ti metal film
  • an annealing process to crystallise TiO 2 involving heating at a temperature of 300°C to 1000°C, preferably for a period of time of 30 min to 4 hours.
  • heating at 350°C in air for 1 hour can be used for the annealing process of the TNT array layer leading to the anatase crystalline phase formation.
  • the relevance of the annealing step is that TNT grown by anodization are amorphous. Amorphous TNT are not stable in acidic conditions and therefore it is preferable to crystallize TNT by annealing. Any crystalline form provides stability, but the low temperature crystalline phase is anatase.
  • Annealing may also be used to stabilize other non-crystalline TiO 2 nanostructures of the present invention, such as nanorods and nanofibres.
  • a layer of titanium (di)oxide nanostructures is applied to a membrane layer comprising a proton-conducting polymer.
  • the proton-conducting polymer may be a sulfonated polymer, polyimide, polyvinylidene fluoride, polybenzimidazole, polysulfone, polyethersulfone, polyetherketone, polyphenylenesulfide, polyphenyleneoxide, polyphosphazene, polyethylenenaphthalate, polyamide, or polyester.
  • the proton-conducting polymers used in structures of the present invention will typically show anionic groups bound to a common backbone.
  • the anionic groups of most importance are sulfonic acid groups but anionic groups may also include carboxylic acid groups, imide groups and amide groups.
  • the proton-conducting polymers used in structures of the present invention are appropriately fluorinated, containing carbon-fluorine atoms in their main chains and/or side chains.
  • the proton-conducting polymer membrane of structures of the invention, bearing a layer of nanostructures is a polymer membrane containing a polymer that contains a partially or fully fluorinated main chain and partially or fully fluorinated side chains containing anionic groups.
  • Preferred polymers for use in the present invention are typically highly fluorinated and most typically perfluorinated. Examples include copolymers of tetrafluoroethylene and one or more fluorinated, acid-functional comonomers. Copolymers having sulfonate group-terminated perfluorovinyl ether groups attached to a poly(tetrafluoroethylene) backbone, such as those commonly referred to as Nafion®, can be used in preferred embodiments of the present invention.
  • the proton-conducting polymer membrane thus contains tetrafluoroethylene-derived units and sulfonate group-terminated perfluorovinyl ether groups.
  • the perfluorinated backbone of Nafion® provides significant mechanical strength and hydrophobicity, and the sulfonic acid group is an exceptional ion-conducting moiety.
  • Flemion® As well as Nafion® (DuPont), Flemion® (Asahi Glass) is another well-known polymer of this type that can be used in the present invention.
  • the equivalent weight (EW), i.e. the weight of polymer such as Nafion (in molecular mass) per mole of sulfonic acid group will commonly be 1200 or less, more typically 1100 or less, more typically 1000 or less, and may be 900 or less, or 800 or less.
  • the polymer can be formed into a membrane by any suitable method.
  • the polymer is typically cast from a suspension. Any suitable casting method may be used, including bar coating, spray coating, slit coating, brush coating, and the like. Alternately, the membrane may be formed from neat polymer in a melt process such as extrusion. After forming, the membrane may be annealed, typically at a temperature of 120°C or higher, typically 150°C or higher.
  • the proton-conducting polymer membrane appropriately has a thickness of at least 10 microns ( ⁇ m) and at most 200 microns ( ⁇ m), preferably at least 20 and at most 50 microns. Thinner membranes are better for proton transfer resistance but are difficult to manufacture and handle. A generally appropriate range of thickness for the proton-conducting polymer membrane will thus be 20 to 50 microns.
  • Proton-conducting polymers of the invention may be incorporated in the structures of the invention in acid or salt form, or at any degree of neutralization between fully protonated and fully deprotonated forms.
  • Figure 3 shows a schematic diagram of a preferred embodiment of a hot press system for transferring a titania nanotube (TNT) array to a polymer membrane.
  • reference numeral (1) refers to the metal plates of the hot press.
  • Reference numeral (2) refers to protective films used to avoid sticking of the first substrate and/or the polymer membrane to the metal plates.
  • a highly heat-stable polymer films such as polyimide can be used for protective films (2).
  • An example is the polyimide Kapton® sold by DuPont.
  • a silicone-coated polypropylene release liner can also be used as described in WO 02/061871 .
  • Entity (4) is the TNT array (5) on the first substrate, such as a titanium (Ti) film, an example of the more general process intermediate of the present invention consisting of titanium (di)oxide nanostructures on a first substrate surface.
  • the TNT array has been transferred to the polymer membrane, which is represented separately as sheet (3) on the left-hand side of the schematic diagram.
  • transfer to a polymer membrane is carried out in a hot press as a temperature of 110°C and at a pressure of 100 bar. Under such conditions it has been found possible to successfully transfer a TNT array to a Nafion® membrane. After processing in the hot press in experiments using a titanium metal foil first substrate (on which titania nanotubes had been grown by anodization), it was found possible to detach the Nafion® membrane bearing a TNT array by simple manual detachment.
  • temperatures for hot press transfer this will depend on the glass transition temperature of the polymer membrane.
  • PFSA type perfluorinated sulfonic acid-based membranes
  • 130°C is an appropriate maximum temperature, but for polymer membranes with a higher hydrocarbon content, a higher temperature could be used.
  • a pressure within the range of 10 bar to 200 bar may be appropriately used, with a temperature within the range of 50°C to 130°C.
  • titanium foils may be advantageously pretreated in one or more of the four following ways:
  • Ti foils used in anodization experiments will have a thickness of less than 1 millimeter, for example 0.10 mm. In a typical embodiment, small sections of Ti foil a few square centimetres are used in anodization. Platinum (Pt) wire may appropriately be used as a counter electrode.
  • step 1 Alternative methods to grow TNTs (step 1), apart from anodization, include a sol-gel template synthesis of ordered TiO 2 nanotubes of uniform diameter using alumina porous membrane (anodic aluminium oxide, AAO) as a template.
  • AAO anodic aluminium oxide
  • the alumina template membrane is dipped into a solution of the titanium oxide precursor(s) and then dried. The template is finally removed by chemical etching.
  • TiO 2 nanotube arrays were obtained by dissolving the alumina template in 3 M aqueous NaOH for several minutes. TiO 2 nanotubes thus formed were then washed several times with distilled water to remove the dissolved anodic alumina membrane and remaining NaOH solution.
  • this composite layer may be hot pressed with/to the polymer electrolyte membrane (the AAO/TNT layer is sandwiched between the polymer electrolyte membrane and the high temperature resistant polymer film (i.e. Kapton®). Finally, chemical etching may be used to selectively dissolve the AAO template (not the polymer membrane).
  • PFSA perfluoro-sulfonic acid
  • a suitable acid would be H 2 SO 4 , which does not damage the polymer membrane. No peel-off step is required in such an embodiment.
  • platinum or platinum alloy materials may be deposited on the surface of the titanium (di)oxide nanostructures e.g. nanotubes.
  • Noble metals other than Pt include ruthenium, osmium, rhodium, iridium, palladium, gold and silver.
  • both the inner surface of nanotubes and the outer surface may support deposited noble metal / noble metal alloys such as platinum or platinum alloy.
  • appropriate weight ranges of noble metal (such as Pt) to titania nanotubes (TNT) will be (weight/weight) comprised between 1% and 100%, preferably between 5% and 40%. Therefore, the amount of Pt as a weight percentage of TNT in preferred embodiments will be at least 5 % and at most 40%.
  • the amount of noble metal, such as Pt will in fact more commonly be determined by one skilled in the art with respect to the geometric area of the electrode in the final electrode assembly.
  • a generally appropriate range of noble metal, such as Pt will thus be at least 0.01 and at most 1 mg/cm 2 of geometric area of the electrode, and preferably at least 0.01 and at most 0.2 mg/cm 2 .
  • PVD Physical Vapour Deposition
  • sputtering chemical deposition methods
  • sol-gel methods or atomic layer deposition.
  • PVD physical vapor deposition
  • the coating method involves purely physical processes such as high temperature vacuum evaporation with subsequent condensation, or plasma sputter bombardment rather than involving a chemical reaction at the surface to be coated as in chemical vapor deposition.
  • Variants of PVD include:
  • Pt has been sputtered onto the gas diffusion layer GDL, the membrane or deposited onto polytetrafluoroethylene, PTFE sheets or similar support substrates and subsequently transferred to the membrane.
  • Pt can be sputtered onto TiO 2 nanotubes using RF or a DC magnetron device.
  • Chemical deposition methods useful for applying noble gas coatings to surfaces in the present invention can be classified into two main groups: the first group comprising Chemical Vapor Deposition (CVD) and Atomic Layer Deposition (ALD) uses a gas phase to transport volatile molecules to the surface serving as a substrate, and the second group of deposition techniques, called Chemical Solution Deposition or Sol-Gel Processing, uses a liquid phase as the mass transfer media.
  • CVD Chemical Vapor Deposition
  • ALD Atomic Layer Deposition
  • Sol-Gel Processing uses a liquid phase as the mass transfer media.
  • Atomic layer deposition is a thin film deposition technique that is based on the sequential use of a gas phase chemical process.
  • the majority of ALD reactions use two chemicals, typically called precursors. These precursors react with a surface one at a time in a sequential, self-limiting, manner. By exposing the precursors to the growth surface repeatedly, a thin film is deposited, as shown for example in US 4 389 973 .
  • Pt can be deposited on TiO 2 nanotubes by ALD.
  • a noble metal may be used as an alloy with one or more other noble metals and/or one or transition metals.
  • transition metals include molybdenum, cobalt, iron, nickel, titanium, tungsten, rhenium, chromium, manganese, niobium and tantalum.
  • a noble metal Pt or another noble metal or alloy thereof is coated on the first substrate bearing titania nanostructures, after optional annealing, but before transfer to the ion-conducting polymer membrane.
  • the noble metal may also be applied after the decal step, i.e. after transfer of the titania nanotubes, to the ion-conducting polymer membrane.
  • loading with platinum prior to transfer to the ion-conducting polymer membrane may well be preferable, because noble metal deposition techniques may damage the polymer electrolyte membrane surface, for example, by ion/electron/particle impacts during sputtering, or by membrane shrinkage after techniques involving contact with a solvent and subsequent drying.
  • the nanotube arrays having an inner surface (inside the nanotubes) and an outer surface, during growth on a first substrate such as titanium foil, the nanotubes have an open top, like a growing chimney, and therefore they are open to coating on both the inside and the outside.
  • summits of the nanotube array are expected to become the bases of the new structure produced, i.e. the summits are expected to be embedded "head first" in the polymer membrane surface, and the inside surface may then be less accessible to noble metal than was the case on the initial substrate.
  • anodic oxidation of titanium was carried out in an electrochemical cell to grow aligned TiO 2 nanotubes.
  • a titanium foil of 0.1 mm thickness with a surface area 18 ⁇ 18 mm (99.6% purity, advent.) was cleaned with ethanol and used as anode (working electrode).
  • a Pt mesh was used as counter-electrode.
  • the two electrodes were placed parallel to each other with a distance of about 2 cm.
  • the anodization experiment was conducted at a constant potential of 30 V for 20 hours using a DC power supply (Jaissle IMP PC-200V).
  • the experiment was carried out at room temperature using a DMSO electrolyte with 6 wt% HF (40% aqueous solution, Merck KGaA).
  • the as-anodized sample was rinsed thoroughly with deionized water and then dried in air. Thermal annealing was performed on the anodized samples at 350°C for 1 h to convert the amorphous oxide tubes to the crystalline anatase phase.
  • the as-annealed sample was decorated with Pt particles using ALD technology.
  • a Nafion® 212 polymer membrane (DuPont) was used to fabricate the membrane electrode assembly. Before being applied to the electrodes, the membrane was pretreated in four steps to remove the organic and inorganic contaminants. First, the Nafion® membrane was boiled in 3 wt% H 2 O 2 solution followed by washing in a ultra-pure water. Then, the membrane was boiled in 0.5 mol/L H 2 SO 4 solution. Finally, the membrane was boiled again in the ultra-pure water. Each step took about 1 h.
  • the cathode coated-membrane was assembled by hot pressing the catalyst coated TNT/Ti foil onto the pretreated Nafion® membrane.
  • the hot pressing was performed at a temperature of 110°C and at a pressure of 100 bar, for 5 min.

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Claims (15)

  1. Structure comprenant une couche comprenant des nanostructures de (di)oxyde de titane, en contact à une extrémité de celles-ci avec une couche de membrane comprenant un polymère conducteur de protons, dans laquelle les nanostructures de (di)oxyde de titane sont des nanotubes de (di)oxyde de titane (TNT),
    dans laquelle la couche comprenant des nanostructures de (di)oxyde de titane contient une rangée de nanotubes de (di)oxyde de titane (TNT) sur la couche de membrane,
    dans laquelle l'angle moyen d'élévation de la direction longitudinale des nanotubes par rapport au plan de la couche de membrane est d'au moins 70°,
    caractérisée en ce que la longueur moyenne de nanotubes est inférieure à 2,0 µm et la couche de catalyseur, qui est une couche parallèle à et en contact avec la couche de membrane et s'étendant jusqu'à l'extrémité des nanotubes opposée à la couche de membrane, ne contient pas d'ionomère.
  2. Structure selon la revendication 1, dans laquelle les nanotubes sont alignés verticalement ou pratiquement verticalement sur la membrane (angle d'élévation d'environ 90°).
  3. Structure selon la revendication 2, dans laquelle la distance moyenne mesurée entre les faces extérieures de nanotubes adjacents est de 50 nm à 400 nm, de préférence de 60 à 200 nm, encore mieux de 80 à 150 nm.
  4. Structure selon la revendication 2 ou 3, dans laquelle le diamètre moyen interne de nanotubes est de 80 nm à 400 nm, et le diamètre moyen externe de nanotubes est de 100 nm à 500 nm.
  5. Structure selon l'une quelconque des revendications 2 à 4, dans laquelle la longueur moyenne de nanotubes est de 0,5 µm à 1,5 µm.
  6. Structure selon l'une quelconque des revendication 1 à 5, dans laquelle la membrane de polymère conducteur de protons contient au moins un polymère présentant une chaîne principale partiellement ou complètement fluorée et des chaînes latérales partiellement ou complètement fluorées contenant des groupes anioniques.
  7. Structure selon la revendication 6, dans laquelle la membrane de polymère conducteur de protons contient des unités dérivées de tétrafluoroéthylène et des groupes perfluorovinyléther terminés par un groupe sulfonate.
  8. Structure selon l'une quelconque des revendications 1 à 7, dans laquelle la membrane polymère présente une épaisseur de 10 µm à 200 µm, de préférence d'au moins 20 µm et d'au plus 50 µm.
  9. Structure selon l'une quelconque des revendications 1 à 8, dans laquelle les nanostructures de (di)oxyde de titane sont revêtues avec un métal noble ou un alliage de métal noble et le métal noble est de préférence le platine.
  10. Procédé de préparation d'une structure selon l'une quelconque des revendications 1 à 9, le procédé comprenant les étapes de :
    (a) croissance de nanostructures de (di)oxyde de titane par anodisation sur un premier substrat ;
    (b) mise en contact des sommets des nanostructures avec une membrane de polymère conducteur d'ions, les sommets des nanostructures se trouvant à l'autre extrémité des nanostructures par rapport aux bases des nanostructures qui sont ancrées sur la surface du premier substrat ;
    (c) pression des sommets des nanostructures dans la surface de la membrane polymère en utilisant une presse à chaud ; et
    (d) détachement des nanostructures du premier substrat,
    dans lequel les nanostructures sont des nanotubes de (di)oxyde de titane (TNT).
  11. Procédé selon la revendication 10, dans lequel les nanotubes de (di)oxyde de titane (TNT) sont alignés pratiquement verticalement sur la surface du premier substrat.
  12. Procédé selon la revendication 10 ou 11, dans lequel le premier substrat est un substrat de métal de titane/feuille de titane.
  13. Procédé selon l'une quelconque des revendications 10 à 12, dans lequel dans l'étape (c), la pression se trouve dans l'intervalle de 10 bars à 200 bars, et la température se trouve dans l'intervalle de 50°C à 130°C.
  14. Procédé selon l'une quelconque des revendications 10 à 13, dans lequel, soit avant le contact entre les nanostructures de (di)oxyde de titane avec la membrane de polymère conducteur d'ions, soit après le transfert des nanostructures de (di)oxyde de titane sur la membrane de polymère conducteur d'ions, les nanostructures de (di)oxyde de titane sont revêtues avec un métal noble ou un alliage de métal noble, le métal noble étant de préférence le platine.
  15. Utilisation d'une structure selon l'une quelconque des revendications 1 à 9 dans une pile à combustible.
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